Control method and device of vehicle air conditioning system and vehicle

Abstract

The invention discloses a control method and device for a vehicle air conditioning system and a vehicle. The control method comprises the steps that when an air valve is in a full-open state, according to the required air volume and the air duct resistance coefficient of each subarea air duct, the corresponding rear static pressure meeting the required air volume of each subarea air duct is calculated, so that multiple rear static pressures are obtained; selecting a target partitioned air duct from the plurality of partitioned air ducts, wherein the target partitioned air duct is the partitioned air duct corresponding to the maximum rear static pressure in the plurality of rear static pressures; the rotating speed of a fan is adjusted according to the required air volume of the target zoning air duct, so that the air volume of the outlet end of the target zoning air duct reaches the required air volume of the target zoning air duct; adjusting the air valve opening degrees of the other partitioned air ducts according to the required air volumes of the other partitioned air ducts, so that the air volumes of the outlet ends of the other partitioned air ducts reach the required air volumes of the other partitioned air ducts; wherein the other partition air ducts are the partition air ducts except the target partition air duct in the multiple partition air ducts.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle air conditioning, and more specifically, to a control method and device for a vehicle air conditioning system, and a vehicle. Background Art

[0002] As an important component of the vehicle, vehicle air conditioning improves the comfort of passengers. With the development of technology, people's demand for vehicle air conditioning is becoming more refined.

[0003] The current vehicle air-conditioning system can achieve temperature control in multiple zones (such as the driver's cab zone, the co-pilot zone, etc.), but how to achieve air volume control in multiple zones is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The embodiments of the present application provide a control method and device for a vehicle air conditioning system, and a vehicle. The following introduces various aspects of the embodiments of the present application.

[0005] In a first aspect, a control method for a vehicle air conditioning system is provided, wherein the vehicle air conditioning system comprises a fan and an air duct, wherein the fan is used to deliver air volume to the air duct, wherein the air duct comprises a plurality of partitioned air ducts, and each of the plurality of partitioned air ducts is provided with an air valve at its outlet, wherein the control method comprises: when the air valve is in a fully open state, according to the required air volume of each partitioned air duct in the plurality of partitioned air ducts and the air duct resistance coefficient, calculating a rear static pressure corresponding to the required air volume of each partitioned air duct to obtain a plurality of rear static pressures; selecting a target partitioned air duct from the plurality of partitioned air ducts, The target partition air duct is the partition air duct corresponding to the maximum rear static pressure among the multiple rear static pressures; according to the required air volume of the target partition air duct, the rotation speed of the fan is adjusted so that the air volume at the outlet end of the target partition air duct reaches the required air volume of the target partition air duct; according to the required air volume of other partition air ducts, the air valve opening of the other partition air ducts is adjusted so that the air volume at the outlet end of the other partition air duct reaches the required air volume of the other partition air ducts; wherein the other partition air ducts are the partition air ducts among the multiple partition air ducts except the target partition air duct.

[0006] As a possible implementation method, after adjusting the rotational speed of the fan, the control method further includes: determining the total air volume delivered by the fan according to the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct; and determining the distributed air volume of the total air volume to be distributed to each partition air duct according to the resistance coefficient of each partition air duct.

[0007] As a possible implementation, an external circulation air intake valve and an internal circulation air intake valve are provided in the air duct, the external circulation air intake valve is used to control the air intake volume of the external circulation, and the internal circulation air intake valve is used to control the air intake volume of the internal circulation, and the total air volume delivered by the fan is determined according to the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct, including: determining the pressure rise generated by the fan according to the PQ characteristic curve of the fan and the total resistance coefficient; determining the front static pressure according to the pressure rise, the resistance coefficient of the external circulation air intake valve, the resistance coefficient of the internal circulation air intake valve and the intake pressure at the external circulation air intake valve; determining the total air volume according to the pressure rise, the front static pressure of the fan and the total resistance coefficient.

[0008] As a possible implementation method, after determining the front static pressure, the control method also includes: controlling the opening of the external circulation intake valve according to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure, so that the intake pressure of the external circulation intake port is less than a preset threshold.

[0009] As a possible implementation, before obtaining multiple rear static pressures, the control method also includes: determining the required air volume of each partition air duct according to the comfort parameters of each partition in the vehicle; the comfort parameters include one or more of the following: the outdoor ambient temperature of the partition, the air volume setting value of the partition, the set temperature of the partition, the difference between the set temperature of the partition and the current temperature of the partition, and the sunlight intensity in the partition.

[0010] As a possible implementation method, adjusting the speed of the fan according to the demand air volume of the target partitioned air duct includes: using a PID algorithm to closed-loop adjust the speed of the fan according to the demand air volume of the target partitioned air duct and the allocated air volume of the target partitioned air duct; and / or adjusting the air valve opening of other partitioned air ducts according to the demand air volume of other partitioned air ducts includes: using a PID algorithm to closed-loop adjust the air valve opening of other partitioned air ducts according to the demand air volume of the other partitioned air ducts and the allocated air volume of the other partitioned air ducts.

[0011] As a possible implementation manner, the multiple partitioned air ducts are four-partitioned air ducts.

[0012] In a second aspect, a control device for a vehicle air-conditioning system, the vehicle air-conditioning system comprises a fan and an air duct, the fan is used to deliver air to the air duct, the air duct comprises a plurality of partitioned air ducts, and the outlet ends of the plurality of partitioned air ducts are all provided with air valves, the control device comprises: a calculation module, used to calculate the rear static pressure corresponding to the required air volume of each partitioned air duct according to the required air volume and the air duct resistance coefficient of each partitioned air duct in the plurality of partitioned air ducts when the air valve is in a fully open state, so as to obtain a plurality of rear static pressures; a selection module, used to select a target partitioned air duct from the plurality of partitioned air ducts, the target The target partition air duct is the partition air duct corresponding to the maximum rear static pressure among the multiple rear static pressures; a first regulating module is used to adjust the rotation speed of the fan according to the required air volume of the target partition air duct, so that the outlet air volume of the target partition air duct reaches the required air volume of the target partition air duct; a second regulating module is used to adjust the air valve opening of the other partition air duct according to the required air volume of other partition air ducts, so that the outlet air volume of the other partition air duct reaches the required air volume of the other partition air duct; wherein the other partition air duct is the partition air duct other than the target partition air duct among the multiple partition air ducts.

[0013] In a third aspect, a vehicle is provided, a memory for storing code; and a processor for executing the code stored in the memory to control the vehicle air-conditioning system to execute the method described in the first aspect or any implementation method of the first aspect.

[0014] In a fourth aspect, a computer program product is provided, comprising a program code, wherein the program code is used to control a vehicle air-conditioning system to execute the method described in the first aspect or any implementation of the first aspect.

[0015] The present application provides a control method for a vehicle air-conditioning system, the vehicle air-conditioning system includes a fan and an air duct, the fan is used to deliver air volume to the air duct, the air duct includes a plurality of partitioned air ducts, and the outlet ends of the plurality of partitioned air ducts are all provided with air valves, the control method includes: when the air valve is in a fully open state, according to the required air volume of each partitioned air duct in the plurality of partitioned air ducts and the air duct resistance coefficient, calculating the rear static pressure corresponding to the required air volume of each partitioned air duct to obtain a plurality of rear static pressures; selecting a target partitioned air duct from the plurality of partitioned air ducts, the target partitioned air duct being the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; according to the required air volume of the target partitioned air duct, adjusting the rotation speed of the fan so that the outlet end air volume of the target partitioned air duct reaches the required air volume of the target partitioned air duct; according to the required air volume of other partitioned air ducts, adjusting the air valve opening of other partitioned air ducts so that the outlet end air volume of other partitioned air ducts reaches the required air volume of other partitioned air ducts; wherein the other partitioned air ducts are the partitioned air ducts other than the target partitioned air duct among the plurality of partitioned air ducts. When the air valve is in the fully open state, this solution selects the partition air duct with the maximum rear static pressure as the target partition air duct according to the required air volume of each partition air duct, and uses the required air volume of the target partition air duct to control the fan speed. At the same time, the required air volume of other partition air ducts is used to control the air valve opening of the corresponding partition air duct, so that the vehicle air-conditioning system can be quickly and accurately controlled to deliver the required air volume to multiple partitions, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a flow chart of a method for controlling a vehicle air conditioning system provided in one embodiment of the present application.

[0017] Figure 2 Schematic diagram of a vehicle air conditioning system provided in one embodiment of the present application.

[0018] Figure 3 It is a schematic diagram of a parallel resistance coefficient pipe network of an air duct in a vehicle air conditioning system provided in one embodiment of the present application.

[0019] Figure 4 It is a schematic diagram of a parallel air volume pipe network of air ducts in a vehicle air conditioning system provided in one embodiment of the present application.

[0020] Figure 5 It is a schematic diagram of a vehicle air-conditioning system control method provided by another embodiment of the present application.

[0021] Figure 6 It is a structural schematic diagram of a control device for a vehicle air-conditioning system provided in one embodiment of the present application.

[0022] Figure 7 It is a schematic diagram of the structure of a vehicle provided in one embodiment of the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0024] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, step, calculation or other action "based on" or "according to" one or more conditions or values ​​can be based on additional conditions or beyond values ​​in practice.

[0025] As an important component of the vehicle, vehicle air conditioning improves the comfort of passengers. With the development of technology, people's demand for vehicle air conditioning is becoming more refined.

[0026] The current vehicle air conditioning system mainly focuses on temperature control. For example, the relevant technology can realize temperature control of multiple zones (such as the cab zone, the co-pilot zone, etc.). However, independent control of air volume has not been fully developed. The design of traditional vehicle air conditioning systems often cannot flexibly meet the fine requirements of different passengers for air volume, especially in terms of the distribution and efficiency of air flow in each area. There is still room for improvement. Therefore, how to achieve multi-zone air volume control is a technical problem that needs to be solved urgently.

[0027] In response to the above problems, the present application provides a control method for a vehicle air-conditioning system, the vehicle air-conditioning system includes a fan and an air duct, the fan is used to deliver air volume to the air duct, the air duct includes a plurality of partitioned air ducts, and the outlet ends of the plurality of partitioned air ducts are all provided with air valves, the control method includes: when the air valve is in a fully open state, according to the required air volume of each partitioned air duct in the plurality of partitioned air ducts and the air duct resistance coefficient, calculating the rear static pressure corresponding to the required air volume of each partitioned air duct to obtain a plurality of rear static pressures; selecting a target partitioned air duct from the plurality of partitioned air ducts, the target partitioned air duct being the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; according to the required air volume of the target partitioned air duct, adjusting the speed of the fan so that the outlet end air volume of the target partitioned air duct reaches the required air volume of the target partitioned air duct; according to the required air volume of other partitioned air ducts, adjusting the air valve opening of other partitioned air ducts so that the outlet end air volume of other partitioned air ducts reaches the required air volume of other partitioned air ducts; wherein the other partitioned air ducts are the partitioned air ducts other than the target partitioned air duct among the plurality of partitioned air ducts. When the air valve is in the fully open state, this solution selects the partition air duct with the maximum rear static pressure as the target partition air duct according to the required air volume of each partition air duct, and uses the required air volume of the target partition air duct to control the fan speed. At the same time, the required air volume of other partition air ducts is used to control the air valve opening of the corresponding partition air duct, so that the vehicle air-conditioning system can be quickly and accurately controlled to deliver the required air volume to multiple partitions, thereby improving the user experience.

[0028] Combined with the following Figure 1 The control method of the vehicle air conditioning system in the embodiment of the present application is described in detail. Figure 1 As shown, the control method 100 of the vehicle air-conditioning system may include steps: S110-S140.

[0029] It should be noted that the vehicle air-conditioning system includes a fan and an air duct. The fan is used to deliver air to the air duct. The air duct includes a plurality of partitioned air ducts. An air valve is provided at the outlet end of each of the plurality of partitioned air ducts. The air valve of each partitioned air duct can be used to control the air volume at the outlet end of the corresponding partitioned air duct.

[0030] The fan in the embodiment of the present application may also refer to a ventilator or a blower, and the present application does not impose any specific limitation on this.

[0031] In the embodiment of the present application, the vehicle air-conditioning system is installed in a vehicle, and the vehicle may be an electric vehicle, a fuel vehicle, a hybrid vehicle, etc., and the present application does not impose any specific limitation on this.

[0032] In the present application, a vehicle may include multiple partitions, and the multiple partitions correspond one-to-one to multiple partition air ducts in the vehicle air conditioning system. The multiple partitions may be two partitions, three partitions, or four partitions, etc. Correspondingly, the multiple partition air ducts may be two partition air ducts, three partition air ducts, or four partition air ducts, etc.

[0033] The above-mentioned multiple partitions may include, for example: one row of left partitions, one row of right partitions, two rows of left partitions and two rows of right partitions in the vehicle, etc., and the present application does not make any specific restrictions on this.

[0034] In step S110, when the air valve is in a fully open state, the rear static pressure corresponding to the required air volume of each partition air duct is calculated according to the required air volume and the air duct resistance coefficient of each partition air duct in the multiple partition air ducts to obtain multiple rear static pressures.

[0035] It should be noted that, in the present application, the rear static pressure may refer to the static pressure after the fan. That is, the rear static pressure corresponding to the required air volume of each partition air duct may refer to the static pressure after the fan corresponding to the required air volume of each partition air duct.

[0036] In the present application, when the air valves of each partition air duct are in the fully open state, the rear static pressure corresponding to the required air volume of each partition air duct can be calculated and determined, and further, multiple rear static pressures corresponding to multiple partition air ducts can be obtained.

[0037] In some implementations, the vehicle where the vehicle air-conditioning system is located includes multiple partitions. Before obtaining multiple rear static pressures, it also includes: determining the required air volume of each partition air duct according to the comfort parameters of each partition in the vehicle; the comfort parameters include one or more of the following: the outdoor ambient temperature of the partition, the air volume setting value of the partition, the set temperature of the partition, the difference between the set temperature of the partition and the current temperature of the partition, the sunlight intensity in the partition, etc., and this application does not make specific restrictions for comparison.

[0038] In some implementations, the temperature and air volume of each zone may be set via a human machine interface (HMI) of the vehicle.

[0039] In some implementations, the plurality of partitioned air ducts may be four partitioned air ducts.

[0040] In step S120, a target partitioned air duct is selected from the plurality of partitioned air ducts, where the target partitioned air duct is the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures.

[0041] It should be understood that if the static pressure behind the fan is maintained at the maximum value among multiple rear static pressures, all partition air ducts can meet their air volume requirements, and there may even be a situation where the air supply volume of some partition air ducts is excessive.

[0042] As an example, if the vehicle air conditioning system includes a left-side partition in the first row (such as the partition in the driver's cabin) and a left-side partition in the second row (such as the partition behind the driver's cabin), the required air volume of the air duct in the left-side partition in the first row is 100 (m 3 / h), the duct resistance coefficient of the left partition duct of the first row is 0.01, and the required air volume of the left partition duct of the second row is 90 (m 3 / h), the duct resistance coefficient of the second row left partition duct is 0.05.

[0043] Furthermore, when the valves of each partition air duct are in the fully open state, the static pressure P1 behind the fan required to meet the required air volume can be calculated based on the required air volume and resistance coefficient of the first row of left partition air ducts, and P1 is 100 (Pa); at the same time, the static pressure P2 behind the fan required to meet the required air volume can be calculated based on the required air volume and resistance coefficient of the second row of left partition air ducts, and P2 is 405 (Pa). If P2 is the maximum value of multiple rear static pressures corresponding to multiple partitions, the partition air duct corresponding to P2 can be used as the target air duct. It should be understood that all partition air ducts can obtain sufficient air volume while maintaining the static pressure behind the fan at P2.

[0044] In step S130, according to the required air volume of the target partition air duct, the rotation speed of the fan is adjusted so that the air volume at the outlet end of the target partition air duct reaches the required air volume of the target partition air duct.

[0045] It should be understood that in the process of adjusting the fan speed according to the required air volume of the target partition air duct, the air valve corresponding to the target partition air duct needs to be controlled in a fully open state (ie, the air valve is controlled to be in the 100% position).

[0046] In some implementations, the speed of the fan may be adjusted in a closed loop using a PID algorithm according to the required air volume of the target partitioned air duct and the allocated air volume of the target partitioned air duct.

[0047] In step S140, according to the required air volume of other partitioned air ducts, the air valve opening of other partitioned air ducts is adjusted so that the air volume at the outlet of other partitioned air ducts reaches the required air volume of other partitioned air ducts. Wherein, other partitioned air ducts are partitioned air ducts other than the target partitioned air duct among the multiple partitioned air ducts.

[0048] In some implementations, the air valve openings of other partitioned air ducts can be adjusted in a closed loop using a PID algorithm based on the required air volume of other partitioned air ducts and the allocated air volume of other partitioned air ducts.

[0049] It should be noted that each of the other partitioned air ducts is independently controlled. That is, the air valve opening of each partitioned air duct can be adjusted in a closed loop using the PID algorithm according to the required air volume and the allocated air volume of each of the other partitioned air ducts, so that the allocated air volume meets the required air volume.

[0050] From the above content, it can be seen that when the air valve is in the fully open state, this scheme selects the partition air duct with the maximum rear static pressure as the target partition air duct according to the required air volume of each partition air duct, and controls the air valve of the target air duct to be in the fully open state. The required air volume of the target partition air duct is used to control the speed of the fan, and the required air volume of other partition air ducts is used to control the opening of the air valve of the corresponding partition air duct. This can quickly and accurately control the vehicle air-conditioning system to deliver the required air volume to multiple partitions, thereby improving the user experience.

[0051] It should be understood that adjusting the speed of the fan and the air valve opening of other partitioned air ducts is a dynamic process, and the distributed air volume of multiple partitioned air ducts (i.e., the air volume distributed to each partitioned air duct) needs to be calculated in real time to determine whether the required air volume is reached. Therefore, after adjusting the speed of the fan, the distributed air volume of each partitioned air duct needs to be calculated.

[0052] For example, after adjusting the speed of the fan, the total air volume delivered by the fan can be determined based on the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct; and the distributed air volume to each partition air duct can be determined based on the resistance coefficient of each partition air duct.

[0053] Furthermore, an external circulation air intake valve and an internal circulation air intake valve are provided in the air duct, the external circulation air intake valve is used to control the air intake volume of the external circulation, and the internal circulation air intake valve is used to control the air intake volume of the internal circulation. Calculating the total air volume delivered by the fan includes: determining the pressure rise generated by the fan according to the PQ characteristic curve and the total resistance coefficient of the fan; then determining the front static pressure according to the pressure rise, the resistance coefficient of the external circulation air intake valve, the resistance coefficient of the internal circulation air intake valve and the air intake pressure at the external circulation air intake valve; further, determining the total air volume according to the pressure rise, the front static pressure of the fan and the total resistance coefficient.

[0054] It should be noted that the PQ characteristic curve of the fan is formed based on the P value of the fan and the Q value of the fan. The PQ characteristic curve of the fan (also called the performance curve) is an important tool to describe the performance relationship of the fan under different working conditions. P stands for air pressure (Pressure) and Q stands for air flow rate (Flow Rate).

[0055] It should be noted that if an air filter is included in front of the fan, the front static pressure in this application may refer to the static pressure in front of the filter; if an air filter is not included in front of the fan, the front static pressure in this application may be the static pressure in front of the fan.

[0056] In some implementations, the vehicle air conditioning system generally further includes an air filter, which is disposed between the air inlet of the air duct and the fan, and is used to filter the incoming air of the air duct. Therefore, the front static pressure may also refer to the front static pressure of the filter.

[0057] It should be understood that during vehicle driving, the air outside and inside the vehicle enter the vehicle air conditioning system through the external circulation and internal circulation air intakes respectively to adjust the interior environment of the vehicle. However, when the air pressure at the external circulation air intake is relatively high, some of the air outside the vehicle may bypass the fan air conditioning box of the vehicle air conditioning system and reversely enter the vehicle through the internal circulation air intake, which may affect the normal working effect of the air conditioning system (for example, the phenomenon of cold wind blowing on the feet in the co-pilot partition in winter). Therefore, it is necessary to control the opening of the external circulation air intake valve to control the intake pressure (or intake volume) of the external circulation air intake to be less than the preset threshold, so as to ensure the balanced control of the air inside and outside the air conditioning box of the vehicle air conditioning system.

[0058] For example, the opening of the external circulation intake valve is controlled according to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure, so that the intake pressure of the external circulation intake port is less than the preset threshold, thereby ensuring the balanced control of the air inside and outside the air-conditioning box of the vehicle air-conditioning system.

[0059] In some implementations, if the required air volume of any partitioned air duct changes, the rear static pressure corresponding to the required air volume of each partitioned air duct can be recalculated according to step S110 so as to reselect the target partitioned air duct.

[0060] In other implementations, if the demand air volume of the target partition air duct has not changed, and the demand air volume of other partition air ducts has decreased, there is no need to reselect the target partition air duct; if the demand air volume of the target partition air duct has not changed, and the demand air volume of other partition air ducts has increased, it is necessary to reselect the target partition air duct; if the demand air volume of the target partition air duct has changed, then reselect the target partition air duct.

[0061] The following describes the embodiments of the present application in more detail with reference to specific examples. Figure 2 to Figure 5 It is only to help those skilled in the art understand the embodiments of the present application, rather than to limit the embodiments of the present application to the specific values ​​or specific scenarios illustrated. Those skilled in the art can obviously make various equivalent modifications or changes based on the examples given, and such modifications or changes also fall within the scope of the embodiments of the present application.

[0062] Figure 2 A structural diagram of a vehicle air conditioning system provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, the vehicle air conditioning system may include but is not limited to: ventilation ducts, fans, evaporators, warm air heat exchangers, air filters (not shown in the figure), and air valves.

[0063] exist Figure 2In the formula, f1 is the external circulation air intake flow rate (also known as the external circulation air volume), P1 is the air intake pressure at the external circulation air inlet, K1 is the resistance coefficient of the external circulation air valve, K2 is the resistance coefficient of the internal circulation air valve, f2 is the internal circulation air intake flow rate (also known as the internal circulation air volume), P2 is the static pressure before the air filter (i.e. the difference between the pressure before the air filter and the atmospheric pressure) or P2 is the front static pressure (i.e. the difference between the pressure before the fan and the atmospheric pressure), P3 is the rear static pressure (i.e. the difference between the pressure after the fan and the atmospheric pressure), K3 is the total air duct resistance coefficient (including air duct resistance, air valve resistance, evaporator resistance and air filter resistance, etc.), f3 is the total air volume of the air duct, P F is the pressure rise of the fan, P F =P3-P2.

[0064] It should be noted that if no air filter is provided in the air conditioning system, P2 is the static pressure before the fan; if an air filter is provided in the air conditioning system, P2 is the static pressure before the air filter.

[0065] It should be noted that Figure 2 The damper in the air conditioner can also be called an air valve. The air mixing damper controls the flow direction of air in the air duct. When the air needs to be heated, the air mixing damper can be controlled to close; when the air does not need to be heated, the air mixing damper can be controlled to open.

[0066] It should be noted that Figure 2 The text description "Atmospheric pressure = crew cabin" means that the current marked position is the air duct outlet, and the atmospheric pressure at the air duct outlet is equivalent to the atmospheric pressure in the vehicle crew cabin. The atmospheric pressure at the outlet of each partition air duct is equivalent to the atmospheric pressure in the corresponding crew cabin partition.

[0067] In some implementations, the relationship between the pressure difference at both ends of the ventilation duct, the duct resistance coefficient, and the air volume is as follows:

[0068] P=k·f^2 (1)

[0069] In formula (1), P is the pressure difference at both ends of the ventilation duct, k is the resistance coefficient of the ventilation duct, and f is the air volume flowing through the ventilation duct.

[0070] In some implementations, the topological relationship of the air duct resistance coefficients of each air valve in the vehicle air conditioning system is a parallel resistance coefficient pipe network. Figure 3 This is an example of a parallel resistance coefficient network. In a parallel resistance coefficient network, the resistance coefficient of each parallel duct and the total parallel resistance coefficient satisfy the following relationship:

[0071]

[0072] In formula (2), K3 is the total resistance of the wind duct in the parallel branch, k 3_1is the wind duct resistance of a parallel branch, k 3_2 is the wind duct resistance of the other parallel branch. For example, K3 is the total wind duct resistance, k 3_1 is the total resistance of the left duct, k 3_2 is the total resistance of the right duct.

[0073] It should be understood that the wind duct resistance coefficients of any two parallel branches satisfy the relationship in formula (2).

[0074] In some implementations, the air volume topology of the air ducts where the air valves in the vehicle air conditioning system are located is a parallel air volume pipe network. Figure 4 This is an example of a parallel air volume network. In a parallel air volume network, the air volume of each parallel air duct and the total parallel air volume satisfy the following relationship:

[0075]

[0076] In formula (3), f3 is the total air volume of the parallel branch duct, f 3_1 is the air volume of a parallel branch, f 3_2 is the air volume of the other parallel branch, k 3_1 is the wind duct resistance of a parallel branch, k 3_2 is the duct resistance of the other parallel branch. For example, f3 is the total air volume of the duct, f 3_1 is the total air volume of the left duct, f 3_2 is the total air volume of the right duct, k 3_1 is the total resistance of the left duct, k 3_2 is the total resistance of the right duct.

[0077] It should be understood that the air volume of the air ducts of any two parallel branches satisfies the relationship in formula (3).

[0078] The above mainly introduces the vehicle air conditioning system and the theoretical basis of air volume and drag coefficient. The following is an introduction to the control theory of the vehicle air conditioning system in this application.

[0079] (1) Determine the required air volume of each zoned air duct. The required air volume of each zoned air duct can be determined based on one or more of the following: the ambient temperature outside the vehicle of the zone, the HMI air volume gear and set temperature of the zone, the difference between the set temperature of the zone and the temperature inside the vehicle of the zone, the sunlight intensity of the zone, etc.

[0080] (2) Determine the target partitioned air duct. According to the required air volume of the partitioned air duct where each air valve is located and the resistance coefficient of the partitioned air duct where each air valve is located, calculate the static pressure P3 (also referred to as the rear static pressure) after the fan required to meet the required air volume of each partitioned air duct when each air valve is in the fully open state, obtain multiple P3 values ​​corresponding to multiple partitioned air ducts, select the maximum P3 value from the multiple P3 values, and use the partitioned air duct corresponding to the maximum P3 value as the target partitioned air duct.

[0081] (3) Control the vehicle air conditioning system to distribute air volume to multiple partitions. The air valve corresponding to the target partition air duct is controlled at 100% position, and the fan speed is adjusted in a closed loop according to the required air volume of the target partition air duct and the estimated distributed air volume, so that the air volume at the outlet end of the target partition air duct reaches the required air volume of the target partition air duct; at the same time, according to the required air volume of other partition air ducts, the air valve opening of other partition air ducts is adjusted, so that the air volume at the outlet end of other partition air ducts reaches the required air volume of other partition air ducts; wherein, other partition air ducts are partition air ducts other than the target partition air duct among the multiple partition air ducts.

[0082] In some implementations, the fan speed may be adjusted in a closed loop using a PID algorithm according to the required air volume of the target partition air duct and the allocated air volume of the target partition air duct (ie, the outlet air volume of the current target partition air duct).

[0083] In some implementations, the PID algorithm can be used to close-loop adjust the air valve opening of other partitioned air ducts based on the required air volume of other partitioned air ducts and the allocated air volume of other partitioned air ducts (i.e., the current outlet air volume of other partitioned air ducts).

[0084] Combining formula (1) to formula (3), Figure 2 and Figure 5 The process of controlling the vehicle air conditioning system to distribute air volume to multiple zones is described in detail, which specifically includes the following steps. The vehicle air conditioning system including an air filter is used as an example for description.

[0085] In step 501, under a certain fan speed condition, the pressure rise (P F ).

[0086] In step 502, the static pressure (P2) before the air filter is obtained by using the calculated fan pressure rise, combined with the intake pressure (P1) of the external circulation air inlet, the resistance coefficient (K1) of the external circulation air valve, and the resistance coefficient (K2) of the internal circulation air valve.

[0087] In step 503, the total air volume (f3), the internal circulation air volume (f2) and the external circulation air volume (f1) of the vehicle air conditioning system are calculated based on the parameters obtained in steps 501 and 502.

[0088] In step 504, according to the resistance coefficient of each partition air duct (such as k 3_1 and k 3_2 ), distribute the total air volume (f3) to different partition air ducts to obtain the distributed air volume of each partition air duct.

[0089] In step 505, a proportional-integral-derivative (PID) controller is used to control the fan speed in a closed loop according to the allocated air volume and the required air volume of the target partition air duct to ensure that the actual air volume delivered by the target partition air duct is consistent with the required air volume. For other partition air ducts, a PID controller is used to control and adjust the air valve opening of the corresponding partition air duct according to the allocated air volume and the required air volume of each partition air duct to ensure that the actual air volume delivered by each partition air duct is consistent with the required air volume.

[0090] As mentioned above in step 501, the pressure rise (P F ), the specific process is as follows:

[0091] a) At a certain fan speed, the PQ curve of the centrifugal fan can be fitted into a quadratic curve, and the analytical expression of the quadratic curve satisfies:

[0092] P F =P0―k F ·(f0―f F )^2 (4)

[0093] Among them, (P0, f0) is the highest point on the parabola, (P F , k F ) are other operating points on the PQ curve.

[0094] At a certain fan speed, the PQ curve of the mixed flow fan can be fitted into a quadratic curve, and the analytical expression of the quadratic curve satisfies:

[0095] P F =P0+k F ·(f0―f F )^2 (5)

[0096] Among them, (P0, f0) is the lowest point on the parabola, (P F , k F ) are other operating points on the PQ curve.

[0097] b) Operating point on the fan PQ curve (P F , k F ) and the total resistance coefficient k3 of the wind duct adapted by the fan satisfies:

[0098] P F =k3·f F ^2 (6)

[0099] In summary, if the PQ curve equation of the fan at a certain speed and the total resistance coefficient equation of the current air duct are known, the fan air volume f under the current working condition can be obtained by combining formula (4) and formula (6), or by combining formula (5) and formula (6): F and fan pressure rise P F .

[0100] It should be understood that the estimation of the internal and external circulation air volume and the estimation of the total air volume all require the static pressure P2 before the air filter, so the solution of P2 is necessary.

[0101] As mentioned above in step 502, the static pressure (P2) before the air filter can be obtained by using the calculated fan pressure rise, combined with the air intake pressure (P1) of the external circulation air intake port, the resistance coefficient (K1) of the external circulation air valve, and the resistance coefficient (K2) of the internal circulation air valve. The derivation process of P2 is as follows:

[0102] f2=f3―f1 (7)

[0103]

[0104] It should be noted that, in the absence of backflow, the air outside and inside the vehicle enter the air conditioning system through the external circulation and internal circulation air intakes respectively, then:

[0105]

[0106] It should be noted that, in the case of backflow, the outside air directly enters the car through the external circulation and internal circulation air intakes, then:

[0107]

[0108] As mentioned above in step 503, the total air volume (f3) of the vehicle air conditioning system is calculated, and the specific process is as follows:

[0109] Given K1, K2, K3, P F In the case of P1, according to formula (7) to formula (13), P2 can be solved, and then f1 and f2 can be solved.

[0110] At the same time, the fan pressure rise: P F =P3-P2, and then we get: P3 = P F +P2, bring in PF And P2, we can get P3.

[0111] Referring to formula (1), f3 can be solved according to P3=K3·f3^2.

[0112] As mentioned above in step 504, according to the resistance coefficient (such as k 3_1 and k 3_2 ), and distribute the total air volume (f3) of the parallel branches to different partitioned air ducts. According to formula (3), f 3_1 and f 3_2 Then, according to the parallel relationship of the air ducts, the distributed air volume of each partition air duct is calculated step by step according to formula (3) (the distributed air volume is an estimated value), and the distributed air volume of each partition air duct can be obtained.

[0113] Combination of the above Figures 1 to 5 The method embodiment of the present application is described in detail. Figure 6 The device embodiment of the present application is described in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so the parts not described in detail can refer to the previous method embodiment.

[0114] Figure 6 FIG. 1 is a schematic diagram of the structure of a control device for a vehicle air conditioning system provided by an embodiment of the present application. The vehicle air conditioning system includes a fan and an air duct. The fan is used to deliver air volume to the air duct. The air duct includes a plurality of partitioned air ducts. The outlet ends of the plurality of partitioned air ducts are all provided with air valves. Figure 6 The control device 600 of the vehicle air-conditioning system may include a calculation module 610 , a selection module 620 , a first adjustment module 630 and a second adjustment module 640 .

[0115] The calculation module 610 is used to calculate the rear static pressure corresponding to the required air volume of each partition air duct according to the required air volume and the air duct resistance coefficient of each partition air duct in the multiple partition air ducts when the air valve is in the fully open state, so as to obtain multiple rear static pressures.

[0116] The selection module 620 is configured to select a target partitioned air duct from the plurality of partitioned air ducts, wherein the target partitioned air duct is the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures.

[0117] The first regulating module 630 is used to regulate the rotation speed of the fan according to the required air volume of the target partitioned air duct, so that the air volume at the outlet end of the target partitioned air duct reaches the required air volume of the target partitioned air duct.

[0118] The second adjustment module 640 is used to adjust the air valve opening of the other partitioned air duct according to the required air volume of the other partitioned air duct, so that the air volume at the outlet end of the other partitioned air duct reaches the required air volume of the other partitioned air duct; wherein the other partitioned air duct is the partitioned air duct among the multiple partitioned air ducts except the target partitioned air duct.

[0119] Optionally, the control device 600 of the vehicle air-conditioning system also includes: a first determination module, used to determine the total air volume delivered by the fan according to the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct after adjusting the speed of the fan; a second determination module, used to determine the distributed air volume of the total air volume to be distributed to each partition air duct according to the resistance coefficient of each partition air duct.

[0120] Optionally, an external circulation intake valve and an internal circulation intake valve are provided in the air duct, the external circulation intake valve is used to control the air intake volume of the external circulation, and the internal circulation intake valve is used to control the air intake volume of the internal circulation, and the first determination module is used to: determine the pressure rise generated by the fan according to the PQ characteristic curve of the fan and the total resistance coefficient; determine the front static pressure according to the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the intake pressure at the external circulation intake valve; determine the total air volume according to the pressure rise, the front static pressure of the fan and the total resistance coefficient.

[0121] Optionally, the control device 600 of the vehicle air-conditioning system also includes: a control module, which is used to control the opening of the external circulation intake valve according to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure after determining the front static pressure, so that the intake pressure of the external circulation intake port is less than a preset threshold.

[0122] Optionally, the vehicle air conditioning system further includes an air filter, wherein the air filter is disposed between the air inlet of the air duct and the fan, and the air filter is used to filter the incoming air of the air duct, and the front static pressure is the front static pressure of the filter.

[0123] Optionally, the control device 600 of the vehicle air-conditioning system also includes: a third determination module, which is used to determine the required air volume of each partition air duct according to the comfort parameters of each partition in the vehicle before obtaining the multiple rear static pressures; the comfort parameters include one or more of the following: the outdoor ambient temperature of the partition, the air volume setting value of the partition, the set temperature of the partition, the difference between the set temperature of the partition and the current temperature of the partition, and the sunlight intensity in the partition.

[0124] Optionally, the first regulating module 630 is used to: use a PID algorithm to closed-loop regulate the speed of the fan according to the demand air volume of the target partition air duct and the allocated air volume of the target partition air duct; and / or, the second regulating module 640 is used to: use a PID algorithm to closed-loop regulate the air valve opening of the other partition air duct according to the demand air volume of the other partition air duct and the allocated air volume of the other partition air duct.

[0125] Optionally, the multiple partitioned air ducts are four-partitioned air ducts.

[0126] Combine the following Figure 7 The present invention introduces a vehicle 700 in an embodiment of the present application. The vehicle 700 may be any type of automobile mentioned above, and the vehicle 700 may be used to implement the method described in the above method embodiment.

[0127] It should be understood that vehicle 700 can be applied to any type of vehicle mentioned above.

[0128] The vehicle 700 may include one or more processors 710. The processor 710 may support the vehicle 700 to implement the method described in the above method embodiment.

[0129] The processor 710 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0130] The vehicle 700 may further include one or more memories 720. The memory 720 stores a program that can be executed by the processor 710 to control the vehicle 700 to execute the method described in the above method embodiment. The memory 720 may be independent of the processor 710 or integrated in the processor 710.

[0131] The vehicle 700 may further include a transceiver 730. The processor 710 may communicate with other devices via the transceiver 730. For example, the processor 710 may transmit and receive data with other devices via the transceiver 730.

[0132] The present application also provides a chip in an embodiment, including a processor, which can be used to call and run a computer program from a memory, so that a device equipped with the chip performs the method described in the above method embodiment. It is understood that the processor can be any type of processor mentioned above. It is understood that the memory can be independent of the chip or integrated in the chip.

[0133] The embodiment of the present application also provides a machine-readable storage medium for storing a program, and the program enables a computer to execute the method in each embodiment of the present application.

[0134] The embodiment of the present application also provides a computer program product. The computer program product includes a program. The program enables a computer to execute the method in each embodiment of the present application.

[0135] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented by software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present disclosure is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a machine-readable storage medium, or transmitted from one machine-readable storage medium to another machine-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The machine-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0136] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments of the present disclosure can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present disclosure.

[0137] In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0138] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0139] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0140] The above is only a specific embodiment of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person skilled in the art who is familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A method for controlling a vehicle air conditioning system, characterized in that: The vehicle air conditioning system comprises a fan and an air duct, wherein the fan is used to deliver air to the air duct, the air duct comprises a plurality of partitioned air ducts, and each outlet end of the plurality of partitioned air ducts is provided with an air valve, and the control method comprises: When the air valve is in a fully open state, the rear static pressure corresponding to the required air volume of each partitioned air duct in the multiple partitioned air ducts is calculated according to the required air volume and the air duct resistance coefficient of each partitioned air duct to obtain multiple rear static pressures; Selecting a target partitioned air duct from the plurality of partitioned air ducts, the target partitioned air duct being the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; According to the required air volume of the target partition air duct, the speed of the fan is adjusted so that the air volume at the outlet end of the target partition air duct reaches the required air volume of the target partition air duct; According to the required air volume of other partitioned air ducts, adjust the air valve opening of the other partitioned air ducts so that the air volume at the outlet end of the other partitioned air ducts reaches the required air volume of the other partitioned air ducts; Among them, the other partitioned air ducts are partitioned air ducts among the multiple partitioned air ducts except the target partitioned air duct.

2. The control method according to claim 1, characterized in that: After adjusting the rotation speed of the fan, the control method further includes: Determine the total air volume delivered by the fan according to the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct; The distributed air volume of the total air volume to each of the partitioned air ducts is determined according to the resistance coefficient of each of the partitioned air ducts.

3. The control method according to claim 2, characterized in that: The air duct is provided with an external circulation air intake valve and an internal circulation air intake valve, the external circulation air intake valve is used to control the air intake amount of the external circulation, and the internal circulation air intake valve is used to control the air intake amount of the internal circulation. The total air volume delivered by the fan is determined according to the air pressure P value of the fan, the air flow Q value of the fan, and the total resistance coefficient of the air duct, including: Determining the pressure rise generated by the fan according to the PQ characteristic curve of the fan and the total resistance coefficient; Determining the front static pressure according to the pressure rise, the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the intake pressure at the external circulation intake valve; The total air volume is determined according to the pressure rise, the static pressure before the fan and the total resistance coefficient.

4. The control method according to claim 3, characterized in that: After determining the front static pressure, the control method further includes: According to the resistance coefficient of the external circulation intake valve, the resistance coefficient of the internal circulation intake valve and the front static pressure, the opening of the external circulation intake valve is controlled so that the intake pressure of the external circulation intake port is less than a preset threshold.

5. The control method according to claim 1, characterized in that: Before obtaining the plurality of rear static pressures, the control method further includes: Determining the required air volume of each partition air duct according to the comfort parameters of each partition in the vehicle; The comfort parameters include one or more of the following: the ambient temperature outside the vehicle of the partition, the air volume setting value of the partition, the set temperature of the partition, the difference between the set temperature of the partition and the current temperature of the partition, and the sunlight intensity in the partition.

6. The control method according to claim 2, characterized in that: The step of adjusting the speed of the fan according to the required air volume of the target partitioned air duct comprises: According to the required air volume of the target partition air duct and the allocated air volume of the target partition air duct, the speed of the fan is adjusted in a closed loop using a PID algorithm; and / or, The adjusting the air valve opening of the other partitioned air duct according to the required air volume of the other partitioned air duct comprises: According to the required air volume of the other partitioned air ducts and the allocated air volume of the other partitioned air ducts, the air valve opening of the other partitioned air ducts is adjusted in a closed loop using a PID algorithm.

7. The control method according to any one of claims 1 to 6, characterized in that: The multiple partitioned air ducts are four-partitioned air ducts.

8. A control device for a vehicle air conditioning system, characterized in that: The vehicle air conditioning system comprises a fan and an air duct, wherein the fan is used to deliver air to the air duct, the air duct comprises a plurality of partitioned air ducts, and each outlet end of the plurality of partitioned air ducts is provided with an air valve, and the control device comprises: a calculation module, configured to calculate, when the air valve is in a fully open state, a rear static pressure corresponding to the required air volume of each partitioned air duct in the multiple partitioned air ducts and an air duct resistance coefficient to obtain multiple rear static pressures; A selection module, configured to select a target partitioned air duct from the plurality of partitioned air ducts, wherein the target partitioned air duct is the partitioned air duct corresponding to the maximum rear static pressure among the plurality of rear static pressures; A first regulating module is used to regulate the rotation speed of the fan according to the required air volume of the target partition air duct, so that the air volume at the outlet end of the target partition air duct reaches the required air volume of the target partition air duct; The second regulating module is used to regulate the air valve opening of the other partitioned air duct according to the required air volume of the other partitioned air duct, so that the air volume at the outlet end of the other partitioned air duct reaches the required air volume of the other partitioned air duct; Among them, the other partitioned air ducts are partitioned air ducts among the multiple partitioned air ducts except the target partitioned air duct.

9. A vehicle, characterized in that: include: A memory for storing codes; A processor is used to execute the code stored in the memory to control the vehicle air conditioning system to perform the method according to any one of claims 1 to 8.

10. A computer program product, characterized in that The method comprises a program code for controlling a vehicle air conditioning system to execute a control method as claimed in any one of claims 1 to 8.

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